20877156784 has 40 divisors (see below), whose sum is σ = 44135456400. Its totient is φ = 9487737600.

The previous prime is 20877156767. The next prime is 20877156791. The reversal of 20877156784 is 48765177802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1285354 + ... + 1301494.

It is an arithmetic number, because the mean of its divisors is an integer number (1103386410).

Almost surely, 2^20877156784 is an apocalyptic number.

It is an amenable number.

20877156784 is an abundant number, since it is smaller than the sum of its proper divisors (23258299616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20877156784 is a wasteful number, since it uses less digits than its factorization.

20877156784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23509 (or 23503 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 20877156784 in words is "twenty billion, eight hundred seventy-seven million, one hundred fifty-six thousand, seven hundred eighty-four".